He Is Said To Have Been Heracles' Child Through Parthenogenesis
The myth about the birth of Hephaestus is contradictory, but a more accepted idea is that the goddess Hera created him herself. The saying goes, before he married Hera, Zeus was married to Titanes, named Metis. Zeus became anxious and worried when he realized that Metis would eventually give birth to a son who might be strong enough to beat him. So he turned his first wife into a bow tie and devoured her unaware that she was already carrying his first child. This later caused Zeus a terrible and intolerable headache, making him desperate for salvation. Finally, one day he ordered him to break his head and open it, and the goddess Athena appeared from his father's head.
The birth of Athena infuriated Hera. She was fooled by Hera as her wife, and she was jealous of Zeus giving birth to such a brilliant child alone. Because of her jealousy, she decided to give birth to a child by herself. Therefore, Hephaestus was born from the will of Hera by parthenogenesis (reproduction without fertilization). But unlike Athena, who was born perfectly, Hephaestus was born ugly and malformed. Tired of his son's imperfections and failures, Hera rejected Hephaestus at birth.